from numpy import *
import operator

def createDataSet():
	group = array([[1.0,1.1],[1.0,1.0],[0,0],[0,0.1]])
	labels = ['A', 'A', 'B', 'B']
	return group, labels

def classify0(inX, dataSet, labels, k):
	dataSetSize = dataSet.shape[0]
	diffMat = tile(inX, (dataSetSize, 1)) - dataSet
	sqDiffMat = diffMat**2
	sqDistances = sqDiffMat.sum(axis=1)
	distances = sqDistances**0.5
	sortedDistIndicies = distances.argsort()
	classCount = {}
	for i in range(k):
		voteIlabel = labels[sortedDistIndicies[i]]
		classCount[voteIlabel] = classCount.get(voteIlabel, 0) + 1
	sortedClassCount = sorted(classCount.items(),
	 key=operator.itemgetter(1), reverse=True)
	return sortedClassCount[0][0]

def file2matrix(filename) :
    fr = open(filename)
    arrayOLines = fr.readlines()
    numberOfLines = len(arrayOLines)
    returnMat = zeros((numberOfLines, 3))
    classLabelVector = []
    index = 0
    for line in arrayOLines:
        line = line.strip()
        listFromLine = line.split('\t')
        returnMat[index, :] = listFromLine[0:3]
        classLabelVector.append(int(listFromLine[-1]))
        index += 1
    return returnMat, classLabelVector

def autoNorm(dataSet)
    minVals = dataSet.min(0)
    maxVals = dataSet.max(0)
    ranges = maxVals - minVals
    normDataSet = zeros(shape(dataSet))
    m = dataSet.shape(0)
    normDataSet = dataSet - tile(minVals, (m, 1))
    normDataSet = normDataSet / tile(ranges, (m, 1))
    return normDataSet, ranges, minVals


def datingClassTest():
	hoRatio = 0.10
	datingDataMat, datingLabels = file2matrix('datingTestSet.txt')
	normMat, ranges, minVals = autoNorm(datingDataMat)
	m = normMat.shape[0]
	numTestVecs = int(m*hoRatio)
	errorCount = 0.0
	for 






